Ellipsograph.



A. BAUMEISTER.

ELLIPSOGRAPH.

APPLICATION man AUG.12. me. 1,224,591 Patented May 1, 1917. 2 5HETSSHEETI- i l LE}.

awe/mm WWW/mm ANTON BAUMEISTER, OF GBOTON, SOUTH DAKOTA.

ELLIPSOGRAPH.

Specification of Letters Patent.

Patented May 1, 1917.

Application filed August 12, 1916. Serial No. 114,609.

To all whom it may concern.

Be it known that I, ANTON BAUMEIsTER, a subject of the Emperor ofGermany, residing at Groton, in the county of Brown and State of SouthDakota, have invented cer tain new and useful Improvements inEllipsographs; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to improvements in drafting instruments, and hasfor its primary object to provide an improved ellipsograph embodyingnovel features of construction whereby the instrument may be quickly andconveniently adjusted to describe ellipses of various shapes and sizes.

l/Vith this and other objects in view the invention consists in thenovel construction, combination and arrangement of parts as will behereinafter more fully described, claimed and illustrated in theaccompanying drawings, in which:

Figure 1 represents a perspective view of the ellipsograph,

Fig. 2 represents a side elevation thereof, and

Fig. 3 represents a longitudinal sectional view on the line 33 of Fig.1.

Referring to the drawing in detail, wherein similar reference numeralsdesignate corresponding parts throughout the several views, the numeral5 indicates the main or center leg of the ellipsograph which is formedat its lower terminal with the usual centering point 6. Adjacent itsupper terminal the leg 5 is pivotally connected at 7 with a pair ofadjustable bracing legs 8, having pointed lower terminals 9 foranchoring the bracing legs in position.

Adjacent the upper terminal of the leg 5 the latter is offset, asindicated at 10, and is provided with a pair of forwardly directedspaced parallel arms 11, which are pivotally connected at 12 with theparallel ends 13 of a U-shaped member, designated generally by thenumeral 14. The web portion 15 of the U-shaped member 13 is formed withan integral hollow collar 16 in which is rotatably mounted the uppersection 17 of a shaft, the lower section 18 of which is connected withthe upper section by a pivot pin 19, whereby the angular position of thetwo sections may be varied as desired.

The several sections 20 forming the leg,

designated generally by the numeral 21, are pivotally connected byjoints 22 and the section at one end of the leg is formed with anenlargement 23, which is rigidly secured to the upper shaft section 17and is confined between the head 24 of said shaft section and the collar16 of the U-shaped member 14. The section at the opposite end of the leg21 is provided with a preferred type of marker 25, which may be adjustedwith relation to the point 6 of the center leg 5 by swinging thesections 20 upon their pivotal axes 22.

An L shaped bearing member 26 is pivotally secured to the upper terminalof the center leg 5 between the arms 11 by a pin 27, which is disposedat right angles to the pivotal connection between the legs of theU-shaped member 14 and the arms 11. The horizontally'disposed end of themember 26 is formed with a substantially semispherical recess or socket28 in which is fitted the rounded lower terminal 29 of the lower shaftsection 18.

The lower shaft section 18 is secured in adjusted angular position withrelation to the upper shaft section 17 by the friction produced at thepivotal connection or joint 19 between these parts, and the L-shapedmember 26 is likewise secured in adjusted position with relation to theupper terminal of the center leg 5 by the friction between said bearingmember and the upper terminal of the leg at the pivotal connection 27.

In use, the shape of the figure described by the marker E, as the latterrotates with the shaft sections 17 and 18, may be varied, as desired, byadjusting the lower shaft section 18 at the proper angle with relationto the upper shaft section 17, while the size of the figure described bythe marker may be varied as desired by moving the marker inwardly towardor away from the point 6 of the center leg 5. As the shaft sections 17and 18 are rotated with the marker E in the act of describing a figure,the angular lower section 18 causes the U-shaped member 1a to oscillate,thus moving the marker E toward and away from the center leg 5 andcausing said marker to describe an ellipse or are.

What I claim is:

1. An ellipsograph comprising a center leg having a pointed end, a pairof spaced parallel arms connected with said leg, a U-shaped frameconnected with said arms,

a shaft including angularly adjustable sections, one of said sectionsbeing journaled in the web portion of said U-shaped member, a legconnected with the upper shaft section, a marker connected with saidleg, and means connected to said leg to rotatably receive the lowerterminal of the lower shaft section.

2. An ellipsograph including a center leg, a pair of spaced parallelarms carried by said leg, a U-shaped member connected at its ends withsaid arms, a shaft including pivoted and relatively adjustable sections,the. upper shaft section being journaled in the U-shaped member, abearing member pivotally secured to the center leg engaging the lowerterminal of the lower shaft section, and 'a marker rigidly connectedwith the upper shaft section including a plurality of relativelyadjustable sections.

3. An ellipsograph including a center leg, a pair of spaced parallelarms connected with the upper terminal of said leg, an inverted U-shapedmember having the free ends pivotally connected with said arms, a shaftincluding pivotally connected and relatively adjustable sections, one ofsaid sections being rotatably mounted in the web portion of the U-shapedmember, an L- shaped member pivotally secured to said center leg andhaving its axis arranged at right angles to the pivotal axis of the U-shaped member, a socket carried by said L- shaped member pivotallyreceiving the lower terminal of the lower shaft section, a legnon-rotatably secured to the upper shaft section, and a marker carriedby said leg.

4. An ellipsograph including a center leg, a pair of auxiliary bracinglegs pivotally secured to said center leg, a rotatable marker, and meansconnecting said marker with said center leg whereby the distance betweenthe latter and said marker is varied during rotary movement of themarker.

5. An ellipsograph including a center leg, members pivotally secured tosaid leg and having their axes angularly disposed, a shaft including apair of pivotally connected sections supported by said pivoted members,and a marker connected with one of the shaft sections.

6. An ellipsograph including a leg, a member pivotally secured to saidleg, a second member pivotally secured to said leg and having its axisarranged at right angles to the axis of the first-mentioned member, ashaft including a pair of pivoted and angularly adjustable sectionssupported in said pivoted members, and a marker connected with one ofthe shaft sections.

In testimony whereof I affix my signature in presence of two witnesses.

ANTON BAUMEISTER.

Witnesses:

EDWARD NEUMAN, E. E. KVITRUD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Iatents, Washington, D. G.

